<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        .active {
            color: red;
        }
    </style>
</head>
<body>

<!--v-cloak是斗篷的意思，加载完app再显示文本-->
<div id="app">
    <h2>{{firstName}} {{lastName}}</h2>
    <h2>{{firstName}} {{lastName}}</h2>
    <h2>{{fullName}}</h2>
</div>


<script src="../js/vue.js"></script>
<script>

    const app = new Vue({
            el: '#app',
            data: {
                msg: 'hello',
                firstName: 'java',
                lastName: 'vue'
            },
            computed: {
                fullName: function () {
                    return this.firstName + ' ' + this.lastName
                }
            },
            methods: {
                getClasses: function () {
                    return {active: this.isActive, line: this.isLine}
                },
                getStyle: function () {
                    return { color : 'green', fontSize: '50px' }
                }
            }
      })

</script>

</body>
</html>